the energy cells themselves now have a configuration option inside like the machines do. Look at the dots in the corners of whatever side of the cell you have the conduits on. If there are blue dots, the cell is set to only input on that side, if it has orange dots in the corners then it is set to output power. By default, all sides are set as inputs only, you have to configure a output in the cell. Look at the image below, see how one is set orange and the rest blue.